Question

calculate the water molecules in 5.4 g of water​

Answer 1

Answer:

This and most other conversions are very clear if one uses the units in each step:

5.4 grams H20 * (1 mole H2O / 18 grams H2O) gives the number of moles of water. Call this X. Note that units come out to “moles H2O”.

X moles H2O * (6.02*10^23 molecules H2O / mole H2O) is your answer.

This can be done in one computation:

5.4 grams H20 * (1 mole H2O / 18 grams H2O) * (6.02*10^23 molecules H2O / mole H2O) gives an answer with units “molecules H2O.

Explanation:

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Answer 2

Answer:

0.299 mole of water x 6.022 x $10^{23}$ molecules/mol = 1.8 x $10^{23}$molecules of water.

Question : Calculate the water molecules in 5.4 g of water

Explanation:

From the above question,

They have given :

The molar mass of water (H2O) is 18.015 g/mol. This means that one mole of water (H2O) weighs 18.015 g.

To calculate the number of water molecules in 5.4 g of water, we first need to calculate the number of moles of water. To do this, we divide the mass (5.4 g) by the molar mass of water (18.015 g/mol):

0.299 mole of water x 6.022 x 10^23 molecules/mol = 1.8 x 10^23 molecules of water

5.4 g ÷ 18.015 g/mol = 0.299 mole of water

Now we can use Avogadro's number (6.022 x 10^23 molecules/mol) to calculate the number of water molecules in 0.299 mole of water:

1 mole of water (H2O) weighs 18.015 g.

5.4 g ÷ 18.015 g/mol = 0.299 mole of water

0.299 mole of water x 6.022 x 10^23 molecules/mol = 1.8 x 10^23 molecules of water

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